The temperature here is -21 C (-6 F) and I noticed that if I'm driving in the car for at least 25 minutes, where the car gets good and warm, it was getting a little to warm, so I started adjusting the temperature down. I'm all the way to 19 C and it still does this. Any lower than 19 and the unit turns the heat off. It doesn't seem to matter what temperature I set it at, the outlet air temp seems to stay the same, meaning if I crank it up to max, the outlet temp feels the same. The only way I can get the temperature down other than open a window, is to lower the fan speed down to one or two. Is it somewhat normal to be able to set the temp at 19 C (66 F) for this cold weather?